National parks reduce the human impact on land by preventing human development.
Well...it has to be about your self so....
Answer:
Area
square centimeter
Diagonal
centimeter
Explanation:
Area of the rhombus is equal to the product of its side and altitude
Thus,
Area of the rhombus
square centimeter
Area of the rhombus is equal to half the product value of two diagonal
square centimeter 
cm
Carbon monoxide is the answer.